Transport and optical studies of PEO/PVP/LiClO 4 based polymer blend electrolytes (original) (raw)
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Effect of complexing salt on conductivity of PVC/PEO polymer blend electrolytes
Bulletin of Materials Science, 2011
Solid polymer electrolyte membrane comprising poly(vinyl chloride) (PVC), poly(ehylene oxide) (PEO) and different lithium salts (LiClO 4 , LiBF 4 and LiCF 3 SO 3 ) were prepared by the solution casting technique. The effect of complexing salt on the ionic conductivity of the PVC/PEO host polymer is discussed. Solid polymer electrolyte films were characterized by X-ray diffraction, FTIR spectroscopy, TG/DTA and ac impedance spectroscopic studies. The conductivity studies of these solid polymer electrolyte (SPE) films are carried out as a function of frequency at various temperatures ranging from 302 K to 353 K. The maximum room temperature ionic conductivity is found to be 0⋅079 × 10 -4 S cm -1 for the film containing LiBF 4 as the complexing salt. The temperature dependence of the conductivity of polymer electrolyte films seems to obey the Vogel-Tamman-Fulcher (VTF) relation.
Ionic Conductivity in Solutions of Poly(ethylene oxide) and Lithium Perchlorate
Macromolecular Symposia, 2010
Summary: Solution casting technique served to prepare solid solutions of lithium perchlorate and poly(ethylene oxide) (PEO) having different molecular masses. Salt concentrations of solutions were varied between around 2 and 13 wt%. Crystallinity and melting point depression served to determine composition and content of amorphous phase as well as thermodynamic behavior of the solutions. Conductivity as a function of salt concentration in the amorphous phase follows a power law at constant temperature (30 °C). It results that both exponent and mobility of charge carriers increase with ascending molecular mass of PEO. The mobility follows an increase with molecular mass proportional to M2.8 indicating dependence of mobility on interstitial volume between chain molecules. Deviation of solution from perfect behavior can be evaluated by melting point depression. Accordingly, increase in conductivity is preferably related to approach to perfect solution behavior. Determination of dielectric function allows some conclusion about ion pair formation in the systems under discussion. It turns out that probability of ion pair formation decreases with increasing molecular mass of PEO in agreement with thermodynamic behavior of the solutions.
Enhanced ionic conductivity in PEO-LiClO4 hybrid electrolytes by structural modification
Journal of Electroceramics, 2006
Poly(ethylene oxide)-LiClO 4-TiO 2 organicinorganic hybrids were synthesized for Li-polymer battery electrolytes using sol-gel processing. The hybrids containing TiO 2 component showed the uniform film formation and also increased ionic conductivity. The hybrid films containing 10 wt% TiO 2 showed the smooth surface morphologies and also the highest ionic conductivity. The molecular-level hybrid formation between PEO and TiO 2 components was identified using FTIR analyses. The hybrids containing TiO 2-Al 2 O 3 mixtures showed the enhanced ionic conductivity compared to those containing only TiO 2 most probably due to the Lewis acidic group formation at the surface of Al 2 O 3 components. The PEO-LiClO 4-TiO 2-Al 2 O 3 hybrids showed high stability both in ionic conductivity and crystallinity. By the sol-gel processing two inorganic components were successfully introduced in the PEO matrix and high-performance solid electrolytes were achieved.
Ionic conduction in plasticized PVC/PAN blend polymer electrolytes
Ionics, 2008
Blended polymer electrolytes with poly(vinyl chloride) (PVC)–poly(acrylonitrile) (PAN) were prepared with different plasticizer concentrations and constant lithium perchlorate (LiClO4) ratio by the solution-casting technique. The structure and complexation of the prepared films were studied by X-ray diffraction and Fourier transform infrared spectroscopy. The effect of the plasticizer on the ionic conduction in these electrolytes was investigated using alternating current impedance measurement and discussed. The temperature-dependant ionic conductivity was carried out in the range 302–373 K. The prepared films were also examined by thermogravimetry/differential thermal analysis to determine their thermal stability.
Advanced Materials Letters, 2017
In this study, poly (vinyl alcohol) (PVA), lithium perchlorate (LiClO4) and nano-sized titanium oxide (TiO2) were employed as host polymer, dopant salt and inorganic filler respectively. The influence of the inorganic filler on ionic conductivity, structural and morphological properties of the polymer matrix are investigated. Ionic conductivity of polymer electrolytes is measured by ac-impedance spectroscopy at ambient temperature. The polymer electrolyte exhibits the highest ionic conductivity of 1.26×10-4 S cm-1 upon addition of 8 wt. % TiO2. Dielectric behavior proves that incorporation of nano-sized TiO2 particles shows a significant effect on the dielectric constant of the polymer electrolyte system. XRD analyses disclose that the addition of TiO2 reduces the crystallinity of the polymer electrolytes which enhances the flexibility of polymer chains.
2013
In the present work, the effect of inorganic fillers with different particle sizes on the composite polymer electrolytes consist of Polyethylene Oxide (PEO), Lithium Trifluoromethanesulfonate (LiCF3SO3) and Ethylene Carbonate (EC) has been explored. Composite polymer electrolytes have been prepared via solution-casting technique. Impedance spectroscopy was conducted at room temperature on the resulted electrolytes. FTIR and SEM/EDX analysis were carried out to further investigate the effect of fillers. Addition of the micron-range inorganic fillers into the polymer electrolyte film leads to an improvement in the ionic conductivity, i.e. from 1.701 × 10 -5 S/cm to 2.970 × 10 -5 S/cm (with addition of Al2O3) and 3.570 × 10 −5 (with addition of SiO2). However, the conductivity was reduced when inorganic fillers with smaller particle size (i.e. nano-range) are employed. The SEM results showed that the filler was well distributed in the polymer matrix; the surface of electrolyte film bec...
Journal of Solid State Electrochemistry, 2012
Characterizations were carried out to study on a new plasticized solid polymer electrolyte that was composed of blends of poly(vinyl chloride) (PVC), liquid 50% epoxidized natural rubber (LENR50), ethylene carbonate, and polypropylene carbonate. This freestanding solid polymer electrolyte (SPE) was successfully prepared by solution casting technique. Further analysis and characterizations were carried out by using scanning electron microscopy (SEM), X-ray diffraction, differential scanning calorimeter (DSC), Fourier transform infrared (ATR-FTIR), and impedance spectroscopy (EIS). The SEM results show that the morphologies of SPEs are compatible with good homogeneity. No agglomeration was observed. However, upon addition of salt, formation of micropores occurred. It is worth to note that micropores improve the mobility of ions in the SPE system, thus increased the ionic conductivity whereas the crystallinity analysis for SPEs indicates that the LiClO 4 salt is well complexed in the plasticized PVC-LENR50 as no sharp crystallinity peak was observed for 5-15% wt. LiClO 4 . This implies that LiClO 4 salt interacts with polymer host as more bonds are form via coordination bonding. In DSC study, it is found that the glass temperature (T g ) increased with the concentration of LiClO 4 . The lowest T g was obtained at 41.6°C when incorporated with 15% wt. LiClO 4 . The features of complexation in the electrolyte matrix were studied using ATR-FTIR at the peaks of C0O, C-O-C, and C-Cl. In EIS analysis, the highest ionic conductivity obtained was 1.20× 10 −3 S cm −1 at 15% wt. LiClO 4 at 353 K.
Molar Conductivity Behaviour of LiClO4 in Poly(ethylene oxide) Solutions
Asian Journal of Chemistry, 2014
The study of salt-polymer solution serves as a powerful fundamental knowledge base for many advance application. Studies of salt-polymer solutions mainly contribute for a better understanding particularly for polymer electrolyte system that mostly applied in secondary battery system 1. Salt-polymer solution is a hybrid system comprises of inorganic salt and polymer that dissolved in a solvent 2. The individual components of the inorganic salt will dissociate due to the thermodynamic interactions between solvent and solute molecules in the electrolyte system. Hence, the added salt provides ions and the polymer help provide a medium for ion conduction 3,4. Normally, in a salt-polymer solution system ions are said to coordinate to the polymer backbone and transport through the polymer medium via the long-ranged segmental motion of the polymer chains 5. Examples of salt-polymer solution are
Studies of ion transport and electrochemical properties of plasticizedcomposite polymer electrolytes
2016
The composite polymer electrolytes (CPEs) composed of polyacrylonitrile (PAN) as host polymer, lithium tetraflouroborate (LiBF4) as dopant salt, dissoAlved in the mixture of ethylene carbonate (EC) and dimethyl phthalate (DMP) as plasticizing solvent, with the addition of silica (SiO2) as inorganic filler were prepared by the solution casting technique. The CPE films were prepared by varying the concentrations of SiO2 from 1 to 5 wt. %. The CPE film containing 3 wt. % of SiO2 exhibits the highest ionic conductivity of 1.36 × 10-2 S cm-1 at room temperature while for temperature dependence studies, the plot obtained obeyed Arrhenius rule and the calculated activation energy was 0.11 eV. The ionic conductivity of the CPEs was found to depend on the concentration of ion pairs of dopant salt as showed by FTIR spectra. The calculated value of lithium ions transport number, tLi+ for the highest conducting CPE film was 0.15. This result indicates that anionic species are the main contribut...